Ricin, a deadly poison was mailed to the offices of U.S. Defense Secretary James Mattis and the Navy’s top officer, Admiral John Richardson on Monday, according to a report.

“Initial tests were positive for ricin, a posion [sic] made from castor beans, but the FBI is now currently doing analysis to make final determinations,” a Pentagon spokesman said according to the report. “The packages never made their way into the Pentagon, but were flagged in a mail delivery building next door.”

“On Monday, the Pentagon Force Protection Agency detected a suspicious substance during mail screening at the Pentagon’s remote screening facility,” Col. Rob Manning said. “The envelopes were taken by the FBI this morning for further analysis. All USPS mail received at the Pentagon mail screening facility yesterday is currently under quarantine and poses no threat to Pentagon personnel.”

According to another report, two people who work in the campaign office of Sen. Ted Cruz (R-Tex.) were exposed to a white powdery substance and are currently undergoing tests at a local hospital in Houston.

“A hazardous materials response team was dispatched to Texas Senator Ted Cruz’s campaign office in Houston on Tuesday morning to investigate a mailed envelope that contained a white powdery substance,” the report said. “Multiple fire trucks and at least one hazmat truck were spotted on the scene after the letter was opened by campaign staff and reported to authorities.”

Authorities have not determined whether the substance sent to Cruz’s office was toxic.

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